[PATCH] gdb: fix maint info btrace

The 'maint info btrace' command forgets to check whether the trace has
already been decoded and keeps appending the same trace to the packet
history at every command.  Fix that.
---
 gdb/btrace.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/gdb/btrace.c b/gdb/btrace.c
index 5349a89001a..f5f2d6da972 100644
--- a/gdb/btrace.c
+++ b/gdb/btrace.c
@@ -3546,10 +3546,14 @@ maint_info_btrace_cmd (const char *args, int from_tty)
 		    version.minor, version.build,
 		    version.ext != NULL ? version.ext : "");
 
-	btrace_maint_update_pt_packets (btinfo);
+	if (btinfo->maint.variant.pt.packets == nullptr)
+	  btinfo->maint.variant.pt.packets = new std::vector<btrace_pt_packet>;
+
+	if (btinfo->maint.variant.pt.packets->empty ())
+	  btrace_maint_update_pt_packets (btinfo);
+
 	gdb_printf (_("Number of packets: %zu.\n"),
-		    ((btinfo->maint.variant.pt.packets == nullptr)
-		     ? 0 : btinfo->maint.variant.pt.packets->size ()));
+		    btinfo->maint.variant.pt.packets->size ());
       }
       break;
 #endif /* defined (HAVE_LIBIPT)  */
-- 
2.34.1

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